Editor: Rosa Margesin
Bacterial communities in Arctic fjelds of Finnish Lapland are stable but highly pH-dependent
Version of Record online: 17 NOV 2006
FEMS Microbiology Ecology
Volume 59, Issue 2, pages 452–465, February 2007
How to Cite
Männistö, M. K., Tiirola, M. and Häggblom, M. M. (2007), Bacterial communities in Arctic fjelds of Finnish Lapland are stable but highly pH-dependent. FEMS Microbiology Ecology, 59: 452–465. doi: 10.1111/j.1574-6941.2006.00232.x
- Issue online: 17 NOV 2006
- Version of Record online: 17 NOV 2006
- Received 13 July 2006; revised 15 September 2006; accepted 17 September 2006.First published online 17 November 2006.
- Arctic-alpine tundra;
- microbial communities;
- terminal restriction fragment length;
- phospholipid fatty acid;
- 16S rRNA gene;
The seasonal and spatial variations of microbial communities in Arctic fjelds of Finnish Lapland were studied. Phospholipid fatty acid analysis (PLFA) and terminal restriction fragment analysis (T-RFLP) of amplified 16S rRNA genes were used to assess the effect of soil conditions and vegetation on microbial community structures along different altitudes of two fjelds, Saana and Jehkas. Terminal restriction fragments were additionally analysed from c. 160 cloned sequences and isolated bacterial strains and matched with those of soil DNA samples. T-RFLP and PLFA analyses indicated relatively similar microbial communities at various altitudes and under different vegetation of the two fjelds. However, soil pH had a major influence on microbial community composition. Members of the phylum Acidobacteria dominated especially in the low pH soils (pH 4.6–5.2), but above pH 5.5, the relative amount of terminal restriction fragments corresponding to acidobacterial clones was substantially lower. Both T-RFLP and PLFA analysis indicated stable microbial communities as the DNA and fatty acid profiles were similar in spring and late summer samples sampled over 3 years. These results indicate that differences in microbial community composition could be explained primarily by variation in the bedrock materials that cause variation in the soil pH.